"The man is nearly 40, hasn't had a job for 20 years and dresses as Wonder Woman. How did he slip through?

"Channel 4 obviously pay someone to say, 'They're fine, let them in the house', when they're clearly not okay.

"I wish I still had my Channel 4 chatshow so I could influence viewers. Richard would be evicted by now."

Graham, 43, dismissed Nikki as "too stupid to be mentally ill". Of Tourette’s sufferer Pete, he said: "I'm so over him. Why doesn't he just take some medication?"

Graham backed Glyn to win, saying: "He's very funny and the only genuine person in there."

Celia Richardson, spokeswoman for the Mental Health Foundation, told the Daily Mail the charity has been inundated with calls from the concerned public.

She also criticised Channel 4 for its treatment of mental health issues on the show and accused Big Brother bosses of "exploiting vulnerable people."

"There is a bit of a bullying culture and we need to be told more about how these vulnerable people are screened and what is being done to protect them. It is crucial."

Although producers say all housemates are put through rigorous psychological testing before entering the house, Ms Richardon said they have failed to provide the foundation with information about which professionals are hired to assess the potential housemates and whether the screening procedures are adequate.